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@uitrit .gieten stent @frn Letters Patent No. 82,245,dated September "i, 1868.

IMPROVEMENT 1N emma-,muss

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. @te Stimuli referrer; in in thse Enters @anni ant mating partei Vtlg; same.

To ALL WHOM rr MAY eoNoERN:

Be it known that I, R. B. PRINDLE, of Norwioh,in the county of Chenango, and in the Stato of New York, have' invented an Improved Self-Locking` Hinge for Blinds; and do hereby declaro that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, making a. part of this specication, in which-.- v l Figure 1 is an edge view' of the blind open.

Figure 2 shows the hinge with the, parts detached.

Figure 3 shows the bearing-surfaces of the hinge.

Figure 4 is e top view of the hinge open.

My invention belongs to the class of hinges that are self-locking when opened..

In the annexed drawings, A represents the window-frame, and B the blind, to which the leaves C and D ere fastened in the usual mennov Projecting from each leaf, at a right angle, or in a. horizontai piane, are circuler-shaped disks or shoulder.

plates, E and F, to the upper ofwhich is attached the pin G, which is provided with a-conical bearing, fitting into a. corresponding seat in the lower disk, F.

Upon the outer side of the disk E is ashoulder, H, formed by a scroll-shaped increase in its diameter, which, when the blind is open, engages a projection, I, upon the leaf D, firmly locking the hinge.

The operation of this hinge is as follows, v iz When the blind is opened, the scroll strikes against the projection I, pressing the disk E` outward, and raising the blind by the conical bearing upon the pin G, until the shoulder'H has passed the-projection I, ywhen the weight of the blind closes the hinge, engaging the shoulder H and projection I, fastening the blind open.-

To close the blind, the bottom is pressed outward until the shoulder H is released, Whenit can hc readily shut. The hole in the lower disk F is sulliciently elongated to allow the upper disk, E, to be moved outward as far as is necessary.

The upper hinge is constructed in any manner thatwill allow the blind to rise es much as is required.

The advantages claimed for this hinge over all others in use are, that it is more easy to operate, stronger, more durable, end being simple in construction, can be furnished at less cost.

Having thus fully set forth the merits of my improvement, what `I cla-im as my invention, and desire to secure by Letters Patent, is.

A soli-locking blind-hinge, formed by Acombining the p'iu G with its conical base, and a. corresponding sontl in the disk F, with the shoulder H, engaging the leaf D, in the manner and for the purpose substantially as herein shown and described. i

' In testimony that I claim the" foregoing, I havo hereunto set my hand, this 10th doy of February, 1868.

R. B. PRINDLE. Witnesses:

E. H. PnrNDLs, G. W. RAY. 

